Drill-support



(No Model.)

P. SGHOPP.

DRILL SUPPORT.

No. 441,509. Patented Nov. 25, 1890.

IIIIIE UNITED STATES PATENT OFFICE.

FREDERIC SCIIOFF, OF PHILADELPHIA, PENNSYLVANIA.

DRILL-SUPPORT.

SPECIFICATION forming part of Letters Patent No. 441,509, dated November 25, 1890.

Application tiled September 15 1890. Serial No. 365,016. (No model.)

To @ZZ whom t may concern-.-

Beit known that I, FREDERIC Sonori?, a citizen of the United States, andaresident of Philadelphia, Pennsylvania, have invented certa-in Improvements in Drill-Supports, of which the following is a specification.

The object of my invention is to prevent the breaking of the drill of a portable drilling-machine, and to also prevent the falling of the portable drill when the drill has iinished boring a hole.

In the accompanying drawings, Figure lis a side View of a drill-support and adrill-frame hung therefrom. Fig. 2 is an enlarged sect-ional portion of Fig. l. Fig. 3 is a section on the line l 2, Fig. 2. Fig. Il is a perspective View of the securing-pin, and Fig. 5 is a diagram view illustrating the action 0f the drill.

My invention is especially applicable t0 portable drilling-machines driven from a ilexible shaft, as shown in Fig. l. It will be understood that it may be applied to drilling-machines driven by hand without departing from my invention.

A is the base or foot of a drill-support which is secured by bolts to a base-plate or other xtnre, and B is a vertical standard, on which slides a head D, secured to the standard by a set-screw shown by dotted lines. Carried by the head D and sliding therein is a beam or rod E, which can also be secured to the head D by means of the set-screw d. Sliding on this beam E is a carrying-block F, which can be fastened in any position on the beam by a set-screw e. In the under side of the block F is an orifice f, Fig. 2, and at the upper end of said orifice is a thrust-bearing block g, made preferably of steel or other hardened material.

G is the feed-screw of the drill, and is provided with a hand-wheel or handle G. The end of this feed-screw is pointed, as shown in Fig. 2, and rests against the thrust-bearing g in the orifice f. Cut in the feed-screw is an annular groove h, and in the blockFare two orifices, which are exposed in theorifice f and are in line with the annular groove h. Adapted to the oriicesin the present instance are the two arms c' z' of the bent securing-pin I. (Shown at Fig. 4.) This securing-pin is spindle N, having a beveled gear-Wheel n,

meshing with a pinion n on the drivingshaft N, coupled in the present instance to the flexible shaft K by the usual flexible- As soon as the point of the drill passesthrough the material being drilled, as shown in Fig. 5, it will have a tendency to feed itself quickly, owing to its freedom and the weight of the drill-frame, and as the resistance is much less will either break in the hole or plunge through and injure the frame or the material being drilled; but by so arranging the block that it carries the drillframe that the drill can only feed forward as dictated by the feed-screw, it will be seen that the feed will be the saine when the drill reaches the position shown in Fig. 5 as when it is in the body of the metal being drilled. Vhen the drill completely passes through the metal, the frame will still be suspended from the block, and the drillcan be readily removed from the metal by simply reversing the feed- The adjustment of the drilland drill-frame to any position can be accomplished by simply sliding the block upon the beam, or the beam in its head D, vertically on the standard.

I claim as my invention- 1. The combination of the drill-support, block carried thereby, a drill-frame suspended from said block, substantially as described.

2. The combination of the drill-support, the block carried thereby, an orifice in said block, a drill-frame, a feed-screw in said block, said feed-screw having an annular recess, with a pin in the block adapted to said recess, substantially as described.

3. The combination of the drill-support, a block, an orifice therein,a drill-frame, afeedloo screw adapted to said orifice, an annular groove in said feed-screw, two transverse orioes in the blook with a U-sliaped pin I, adapted to the said orifices and to the groove in the feed-screw, substantially as described. 4. The combination of the drill-support, a block adjustably secured thereto, an orifice in the said block, a drill-frame, a feed-screw therefor adapted to said oriee and suspended from said block, substantially as described.

5. The combination of the drill-support, :t block thereon, an oriliee in said block with a hardened thrust-bearingin said orifice, a drillframe and feed-screw adapted to said frame and pointed at one end to bear against the 15 said thrust-bearing in said orifice, an annular groove in said feed-screw, and a pin in the block adapted to said groove, and by which the feed-screw and drill-frame are supported, substantially as described.

In testimony whereof;` I have signed my naine to this specification in the presence of two subscribing Witnesses.

FREDERIC SCIIOFF.

Witnesses:

EUGENE ELTERICH, HENRY HoWsoN. 

